The performance quoted represents past performance and does not guarantee future results. Investment return and principal value of an investment will fluctuate so that an investor's shares, when sold or redeemed, may be worth more or less than the original cost. Current performance may be lower or higher than the performance quoted.

Source: Lipper. Data reflects different methodology from the BlackRock calculated returns in the Returns tab. The $10,000 Hypothetical Over Time chart reflects a hypothetical $10,000 investment in the investor class of shares noted and does not assume the max sales charge. Had sales charge been included, returns would have been lower. The chart uses total return NAV performance and assumes reinvestment of dividends and capital gains. Fund expenses, including 12b-1 fees, management fees and other expenses were deducted. Performance for other share classes will vary.

Overall Lipper Leaders ratings based on an equal-weighted average of percentile ranks for each measure over 3-, 5-, and 10-year periods (if applicable) and do not take into account the effects of sales charges for these categories (Consistent Return, Preservation, Total Return, Expense, and Tax Efficiency) as of Jul 31, 2018 out of 458, 5,775, 463, 265 and 463 Funds, respectively in Lipper's Core Bond Funds classification.

The fund itself has not been rated by an independent rating agency. Credit quality ratings on underlying securities of the fund are received from S&P, Moody’s and Fitch and converted to the equivalent S&P major rating category. This breakdown is provided by BlackRock and takes the median rating of the three agencies when all three agencies rate a security the lower of the two ratings if only two agencies rate a security and one rating if that is all that is provided. Unrated securities do not necessarily indicate low quality. Below investment-grade is represented by a rating of BB and below. Ratings and portfolio credit quality may change over time.

Negative weightings may result from specific circumstances (including timing differences between trade and settle dates of securities purchased by the funds) and/or the use of certain financial instruments, including derivatives, which may be used to gain or reduce market exposure and/or risk management. Certain transactions the funds may utilize may give rise to a form of leverage through either (a) additional market exposure or (b) borrowing capital in an attempt to increase investment return. The use of such transactions includes certain leverage-related risks, including potential for higher volatility, greater decline of the fund’s net asset value and fluctuations of dividends and distributions paid by the fund.

15 of 25 U.S. bond funds, accounting for 88% of our assets, have 1st quartile performance* 22 of 25 U.S. bond funds, accounting for 88% of our fixed income funds, are priced in the least expensive quartile†

Portfolio Managers

Portfolio Managers

Rick Rieder, Managing Director, is BlackRock's Global Chief Investment Officer of Fixed Income, and Co-head of BlackRock's Global Fixed Income platform, a member of BlackRock's Global Operating Committee and Chairman of the BlackRock firm-wide Investment Council.

Before joining BlackRock in 2009, Mr. Rieder was President and Chief Executive Officer of R3 Capital Partners. He served as Vice Chairman and member of the Borrowing Committee for the U.S. Treasury. Mr. Rieder is currently a member of the Federal Reserve Bank of New York's Investment Advisory Committee on Financial Markets, and was inducted into the Fixed Income Analysts Society Fixed Income Hall of Fame in 2013, and was nominated for Fixed Income Manager of the Year by Institutional Investor for 2014.

From 1987 to 2008, Mr. Rieder was with Lehman Brothers, most recently as head of the firm's Global Principal Strategies team, a global proprietary investment platform. He was also global head of the firm's credit businesses, Chairman of the Corporate Bond and Loan Capital Commitment Committee, and a member of the Board of Trustees for the corporate pension fund. Before joining Lehman Brothers, Mr. Rieder was a credit analyst at SunTrust Banks in Atlanta.

Mr. Rieder earned a BBA degree in Finance from Emory University in 1983 and an MBA degree from The Wharton School of the University of Pennsylvania in 1987. He is a member of the board of Emory University, Emory's Business School, and the University's Investment Committee and is the Vice Chairman of the Finance Committee. Mr. Rieder is founder and chairman of the business school's BBA investment fund and community financial literacy program.

Mr. Rieder serves as Chairman of the Board of North Star Academy's eleven Charter Schools in Newark, New Jersey and is the Founder and Chairman of the Board of Graduation Generation Public School Collaboration in Atlanta. He is a Trustee for the U.S. Olympic Committee, and on the board of advisors for the Hospital for Special Surgery. He serves on the National Leadership Council of the Communities in Schools Educational Foundation and on the board of Big Brothers/Big Sisters of Newark and Essex County Mr. Rieder was honored at the Choose Success Awards ceremony in Atlanta in 2015 for his dedication to public education in Atlanta through CIS and Graduation Generation.

Bob Miller, Managing Director, is head of the U.S. Multi-Sector Fixed Income team within BlackRock's Global Fixed Income group and a member of the Global Fixed Income executive team. He is a portfolio manager of BlackRock's Core Bond, Total Return, and Strategic Income Opportunities Funds.

Prior to joining BlackRock in 2011, Mr. Miller was a co-founder and partner at the Round Table Investment Management Company, a multi-strategy, research-based investment company, where he managed a global macro strategy. Previously, Mr. Miller spent 20 years at Bank of America, where he served in a variety of roles, most recently as senior portfolio manager for the bank's proprietary multi-asset class investment portfolio. Mr. Miller managed global interest rate, credit and foreign exchange portfolios during his tenure at Bank of America. Mr. Miller is a Trustee of Davidson College and serves as a member of the Investment Committee and the Athletics Committee. He is also actively involved with the Davidson July Experience program. Mr. Miller is a former Trustee and past Chairman of the Board at Trinity Episcopal School in Charlotte, NC. He currently serves as an advisor to the TES Investment Committee. He previously served as an advisor to the Investment Committee of St. Mary's School in Raleigh, NC.

David Rogal, Director, is a member of the Multi-Sector Retail & Rates team within BlackRock's Americas Fixed Income Group. He is a portfolio manager on the Multi-Sector Mutual Fund Team.

Mr. Rogal moved to his current role in 2009. Previously, he was a member of BlackRock's Multi-Asset Portfolio Strategies (MAPS) group. Within MAPS, he was part of the Strategic Advice Service team where he focused on various research and analytical projects, and was responsible for asset allocation analysis and liability-based portfolio structuring for taxable clients and prospects. Mr. Rogal began his career at BlackRock in 2006 as an analyst in the Financial Institutions Group.

Mr. Rogal earned a BA degree, Phi Beta Kappa, in economics and genetics from Cornell University in 2006.

BlackRock funds are also available through certain brokerage accounts. Visit your brokerage today to see how you can get started.

Carefully consider the Funds' investment objectives, risk factors, and charges and expenses before investing. This and other information can be found in the Funds' prospectuses or, if available, the summary prospectuses, which may be obtained by visiting the iShares ETF and BlackRock Fund prospectus pages. Read the prospectus carefully before investing. Investing involves risk, including possible loss of principal.

The Funds are distributed by BlackRock Investments, LLC (together with its affiliates, “BlackRock”).

Important Information

1Source: Morningstar, based on cumulative period 3/31/13-3/31/18. The BlackRock Total Return Fund (MAHQX) had a correlation of 0.07 versus the Morningstar Intermediate-Term Bond Category Average of 0.12 to the S&P 500 Index. Past performance is no guarantee of future results.

2Source: Morningstar as of 3/31/18. The fund was ranked in the 7th percentile over 5 years.

3Source: Morningstar. Based on five year data from 3/31/13-3/31/18. The fund (MAHQX) had a higher 5 year return (2.71%) versus the Morningstar Intermediate-Term Category average (1.73%), and a lower correlation (0.07) versus the category average (0.12) in relation to the S&P 500 index.

Carefully consider the Funds' investment objectives, risk factors, and charges and expenses before investing. This and other information can be found in the Funds' prospectuses or, if available, the summary prospectuses which may be obtained by visiting the iShares Fund and BlackRock Fund prospectus pages. Read the prospectus carefully before investing.

*Source: BlackRock and Morningstar. As of 6/30/18. 15 of 25 funds accounts for 60% of our active fixed income mutual funds. Over the 1, 3, 5 and 10 year periods, 11, 12, 15 and 11 of BlackRock fixed income funds are in the first quartile of their respective Morningstar categories. Based on institutional share classes of BlackRock open-end taxable and tax-free fixed income funds (based on 25 funds).88% statistic based on $91.4B out of $104.2B AUM of all share classes of the funds. Strategic Income Opportunities Fund AUM is $35.6B which accounts for 39% of the total $91.4B AUM of funds that have first quartile performance.Institutional shares may not be available to all retail investors. Performance for different share classes may vary.

†Source: Morningstar. As of 5/31/18. Current fee rankings may vary based on recent and frequent prospectus updates to the funds within the respective Morningstar categories. Analysis based only on institutional shares of BlackRock active retail fixed income funds vs. institutional shares of active fixed income funds within their respective Morningstar categories. Expenses are based on the funds’ most recent prospectus net expense ratios, excluding investment dividend expense, interest expense, and certain other fund expenses. Morningstar category net expense ratio also excludes these expenses. Includes active open-end taxable and tax-free fixed income mutual funds only, and excludes index funds. 88% of BlackRock active fixed income funds are in the lowest fee quartile (22 out of 25 funds). Based on 25 BlackRock active taxable and tax-free funds.Institutional shares may not be available to all retail investors. Performance for different share classes may vary.

The portfolio holdings information shown for BlackRock Total Return Fund (the “Fund”) on this site are the portfolio holdings of Master Total Return Portfolio (the “Master Portfolio”). The Fund is a “feeder” fund that invests all of its assets in the Master Portfolio, a mutual fund that has the same investment objectives and strategies as the Fund. All investments are made at the level of the Master Portfolio. The Fund’s investment results will correspond directly to the investment results of the Master Portfolio. Because the Master Portfolio may have other investors, the percentage of the Master Portfolio held by the Fund may change from time to time. As of June 30, 2018, the Fund held 95.18% of the Master Portfolio.

The fund is actively managed and its characteristics will vary.

Bond values fluctuate in price so the value of your investment can go down depending on market conditions.

International investing involves special risks including, but not limited to currency fluctuations, illiquidity and volatility. These risks may be heightened for investments in emerging markets.

Fixed income risks include interest-rate and credit risk. Typically, when interest rates rise, there is a corresponding decline in bond values. Credit risk refers to the possibility that the bond issuer will not be able to make principal and interest payments.

Principal of mortgage- or asset-backed securities normally may be prepaid at any time, reducing the yield and market value of those securities.

Obligations of US govt. agencies are supported by varying degrees of credit but generally are not backed by the full faith and credit of the US govt.

Non-investment-grade debt securities (high-yield/junk bonds) may be subject to greater market fluctuations, risk of default or loss of income and principal than higher rated securities.

The fund may use derivatives to hedge its investments or to seek to enhance returns. Derivatives entail risks relating to liquidity, leverage and credit that may reduce returns and increase volatility.

Short-selling entails special risks. If the fund makes short sales in securities that increase in value, the fund will lose value. Any loss on short positions may or may not be offset by investing short-sale proceeds in other investments.

Morningstar Analyst Rating™is not a credit or risk rating. It is a subjective evaluation performed by Morningstar’s manager research group, which consists of various Morningstar, Inc. subsidiaries (“Manager Research Group”). In the United States, that subsidiary is Morningstar Research Services LLC, which is registered with and governed by the U.S. Securities and Exchange Commission. The Manager Research Group evaluates funds based on five key pillars, which are process, performance, people, parent, and price. The Manager Research Group uses this five pillar evaluation to determine how they believe funds are likely to perform relative to a benchmark, or in the case of exchange-traded funds and index mutual funds, a relevant peer group, over the long term on a risk-adjusted basis. They consider quantitative and qualitative factors in their research, and the weight of each pillar may vary. The Analyst Rating scale is Gold, Silver, Bronze, Neutral, and Negative. A Morningstar Analyst Rating of Gold, Silver, or Bronze reflects the Manager Research Group’s conviction in a fund’s prospects for outperformance. Analyst Ratings ultimately reflect the Manager Research Group’s overall assessment, are overseen by an Analyst Rating Committee, and are continuously monitored and reevaluated at least every 14 months. For more detailed information about Morningstar’s Analyst Rating, including its methodology, please go to global.morningstar.com/managerdisclosures/.

The Morningstar Analyst Rating (i) should not be used as the sole basis in evaluating a fund, (ii) involves unknown risks and uncertainties which may cause Analyst expectations not to occur or to differ significantly from what they expected, and (iii) should not be considered an offer or solicitation to buy or sell the fund.

Performance results reflect past performance and are no guarantee of future results. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. All returns assume reinvestment of all dividends. Performance information shown without sales charge would have been lower if the applicable sales charge had been included. Performance during periods of exceptional market conditions should not be expected to be repeated in a normal market environment. Current performance may be lower or higher than the performance data quoted.

Investing involves risk, including possible loss of principal.

Fund details, holdings and characteristics are as of the date noted and subject to change.

Yields are based on income earned for the period cited and on the Fund's NAV at the end of the period.

Some BlackRock funds make distributions of ordinary income and capital gains at calendar year end. Those distributions temporarily cause extraordinarily high yields. There is no assurance that a fund will repeat that yield in the future. Subsequent monthly distributions that do not include ordinary income or capital gains in the form of dividends will likely be lower.

The Funds are distributed by BlackRock Investments, LLC (together with its affiliates, “BlackRock”).